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Published byWilfrid Wilkinson Modified over 9 years ago
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Hot gas cleaning in biomass gasification Skoblja S., Malecha J., Koutský B., Solich M. 16.09.2004 ICT Prague Department of Gas, Coke and Air Protection Faculty of Environmental Technology
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Biomass gasification biomass+O 2 +(N 2 )+(H 2 O) gas + C n H m +tar +dust
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Process Temperature
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Catalytic Tar Removal (model) toluene: 3 g.m -3 add H 2 O: 26,0 g.m -3 ; flow 108 ml.min -1,GHSV=8200; 35,8% CO 2 ; 47,6% N 2 ; 16,6% H 2 naphthalene: 1,6 g.m -3 add H 2 O: 24,4 g.m -3 ; flow 112 ml.min -1,GHSV=8900; 21,0% CO 2 ; 70,1% N 2 ; 8,9% H 2
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Hot Gas Cleaning on Dolomite Biomass + PETF (25%) fluid gasification Catalyst: 0,5 l dolomite, GSHV=1000, Hot Filter: river sand 0,16-0,50 mm, V=150 ml 525°C, gas flow 0,5 m 3.h -1, dust 3,7 g.m -3
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Catalytic Tar Removal (real gas) Gas composition before and after catalytic reactor 1 wood pellet air gasification, downdraft gasifier, feed ratio: 5,8 kg.h -1, total gas flow 10-14 m 3.h -1, reactor gas flow 1 m 3.h -1 (dust <10 g.m -3, High tar<1 g.m -3 ) catalyst G 56A, 240 g, 530°C,add water: 131 g.h -1.m -3 GHSV=4700 1 Equipment were located on NTNU, Department of Thermal Energy and Hydropower, Hustad J., Risner H. Horizontal bed filter 1 D= 85mm Area=57cm 2 1: 250 ml olivine sand, d p =0,351 mm 2: 250 ml G56A, d p =1-2 mm Gas flow: 1,0 nm 3.h -1
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Hot Gas Cleaning
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Desulphurization dolomite (CaMg(CO 3 ) 2 ) Available materials: ZnO (ZnO-TiO), Fe 2 O 3 (Fe), CaO, MnO (MnO,Fe 2 O 3,CaO) CuO (Cu), NiO (Ni) T1T1 T2T2
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Thermodynamics Equilibrium H 2 S concentration in dependence on H 2 O and temperatures
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Kinetics Temperature Influence on desulphurization rate dolomite (2MPa) Calcinated dolomite (2MPa)
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Kinetics Influence of calcinations and H 2 S concentration on reaction rate Calcinated and half calcinated dolomite ( 750 °C, 2MPa) Partial pressure H 2 S on reaction rate ( 750 °C, 2MPa)
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Desulphurization apparatus Gas flow: 50 l.h -1 dp=0.315-0.500 mm, (5-12g) C(H 2 S)=500 ppm (760 mg.m -3 )
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Output gas composition Gas flow: 50 l.h -1, C input (H 2 S)=760 (843) mg.m -3
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Output concentration H 2 S Gas flow: 50 l.h -1, C input (H 2 S)=760 (843) mg.m -3
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